ALSA: sound/pci/azt3328.h: no variables for enums

AZF_FREQUENCIES and AZF_GAME_CONFIGS were variables, and this doesn't
seem to have been intended.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>